US warns of credible mass-casualty threat in Tsaritsyn; FSB cites terror plot data

The US has issued a warning of a credible threat of mass casualties in Tsaritsyn, a city in Russia, based on intelligence. Russia's FSB claims it received data on the preparation of a terrorist act, but details remain unverified. This marks a rare public US warning about a specific Russian city, potentially indicating heightened security concerns or an attempt to pressure Moscow.

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